WO2022068380A1 - Backlight module and display device - Google Patents

Abstract

The present application provides a backlight module and a display device. The backlight module comprises: a plurality of lamp groups provided on a base substrate, the plurality of lamp groups being arranged in an array on the base substrate, and each lamp group comprising a plurality of mini light-emitting diodes, a plurality of lead wires in the lamp group, an external anode, and an external cathode; a plurality of anode wires respectively electrically connected to the external anodes of a plurality of rows of lamp groups; and a plurality of cathode wires respectively electrically connected to the external cathodes of a plurality of rows of lamp groups. In at least some of the plurality of cathode wires, a same cathode wire is electrically connected to the external cathodes of lamp groups located in different rows, so as to provide, by means of time-division multiplexing, cathode signals to the lamp groups located in the different rows. Same-wire lamp groups comprise a plurality of lamp groups that are electrically connected to a same cathode wire, same-type anode wires comprise a plurality of anode wires connected to the same-wire lamp groups, and the orthographic projections of the same-type anode wires on the base substrate do not overlap the orthographic projections of the lead wires in a same lamp group on the base substrate.

Description

Backlight Modules and Display Devices

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of the Chinese Patent Application No. 202011069930.4 filed with the China Patent Office on September 30, 2020, the entire disclosure of which is incorporated herein by reference.

technical field

The present disclosure relates to the field of display technology, and in particular, to a backlight module and a display device.

Background technique

Light Emitting Diode (LED for English abbreviation) technology has been developed for nearly 30 years, and its application range is constantly expanding. With the development of technology, the sub-millimeter light-emitting diode (Mini Light Emitting Diode, abbreviated as Mini LED) has gradually become a research hotspot in the field of display technology. For example, Mini LEDs can be used in backlight modules in liquid crystal display devices as light-emitting elements of backlight modules. In this way, by utilizing the advantages of Mini LED, the backlight module can achieve the advantages of regional dimming, fast response, simple structure and long life.

The above information disclosed in this section is only for an understanding of the background of the inventive concepts of the present disclosure and therefore it may contain information that does not form the prior art.

SUMMARY OF THE INVENTION

In order to solve at least one aspect of the above problems, embodiments of the present disclosure provide a backlight module and a display device.

In one aspect, a backlight module is provided, the backlight module comprising:

substrate substrate;

A plurality of lamp groups arranged on the base substrate, the plurality of lamps are arranged in an array on the base substrate, and each lamp group includes a plurality of sub-millimeter light emitting diodes, a plurality of inner wires of the lamp group, an external an anode and an external cathode, the plurality of inner wires of the lamp group are electrically connected in series with the plurality of sub-millimeter light emitting diodes;

a plurality of anode wirings, the plurality of anode wirings are respectively electrically connected to the external anodes of the multi-row lamp groups;

a plurality of cathode wirings, the plurality of cathode wirings are respectively electrically connected with the external cathodes of the multi-row lamp groups,

Wherein, in at least some of the plurality of cathode wirings, the same cathode wiring is electrically connected to the external cathodes of the lamp groups located in different rows, so as to transmit the time-division multiplexing to the external cathodes of the lamp groups located in different rows. The lamp group provides the cathode signal; and

The same wiring lamp group includes a plurality of lamp groups electrically connected to the same cathode wiring, and the same type of anode wiring includes a plurality of anode wirings connected to the same wiring lamp group, and the same type of anode wiring is in the lining. The orthographic projection on the base substrate does not overlap with the orthographic projection of the wires in the same lamp group on the base substrate.

According to some exemplary embodiments, the plurality of cathode wirings are arranged at intervals, the base substrate includes a plurality of regions, and any two adjacent regions in the plurality of regions are formed by at least one cathode wiring in each region. The orthographic projections on the base substrate are spaced apart; the orthographic projections of the same type of anode wiring on the base substrate are respectively located in different regions of the plurality of regions.

According to some exemplary embodiments, the plurality of anode wirings includes a plurality of sets of anode wirings, and an orthographic projection of the plurality of anode wirings in each set of anode wirings on the base substrate falls within the plurality of anode wirings In the same area in the area; the plurality of lamp groups connected to each group of anode wirings are respectively electrically connected to different cathode wirings.

According to some exemplary embodiments, the plurality of lamp groups are arranged on the base substrate in an array of m rows and n columns; the number of the plurality of cathode wirings is M, and the number of the plurality of anode wirings is M. The number is m, and the number of the multiple groups of anode wiring is N, wherein m, n and M are all positive integers greater than or equal to 2, m is more than 2 times of M, and N is the rounded integer after dividing m by M value.

According to some exemplary embodiments, the number of the plurality of regions is N, and the N groups of anode wirings are respectively located in the N regions.

According to some exemplary embodiments, the N groups of anode wirings include at least a first group of anode wirings, a second group of anode wirings, and a third group of anode wirings, and the N regions include at least a first region, a second group of anode wirings, and a third group of anode wirings. area and a third area, the orthographic projections of the first group of anode wirings, the second group of anode wirings and the third group of anode wirings on the base substrate fall into the first area and the second area, respectively and the third area, the orthographic projection of the first group of anode wirings on the base substrate does not overlap with the orthographic projection of the wires in the lamp group on the base substrate.

According to some exemplary embodiments, the orthographic projection of the second group of anode wirings on the base substrate overlaps with the orthographic projection of some of the wires in the plurality of lamp groups on the base substrate, so The orthographic projections of the third group of anode wirings on the base substrate overlap with the orthographic projections of other wires in the plurality of lamp groups on the base substrate.

According to some exemplary embodiments, the anode wiring and the cathode wiring both extend in a first direction, and some of the wires in the plurality of lamp groups extend in the first direction, and the plurality of lamp groups extend in the first direction Others of the inner wires extend in a second direction that intersects the first direction.

According to some exemplary embodiments, the plurality of cathode wirings are divided into N-1 groups, and the N-1 groups of cathode wirings are arranged on the base substrate at equal intervals.

According to some exemplary embodiments, the width of each of the wires within the plurality of lamp groups is greater than the width of each of the plurality of anode wires and the plurality of cathode wires.

In another aspect, a backlight module is provided, the backlight module comprising:

substrate substrate;

A plurality of lamp groups arranged on the base substrate, the plurality of lamps are arranged in an array on the base substrate, and each lamp group includes a plurality of sub-millimeter light emitting diodes, a plurality of inner wires of the lamp group, an external an anode and an external cathode, the plurality of inner wires of the lamp group are electrically connected in series with the plurality of sub-millimeter light emitting diodes;

a plurality of anode wirings, the plurality of anode wirings are respectively electrically connected to the external anodes of the multi-row lamp groups;

a plurality of cathode wirings, the plurality of cathode wirings are respectively electrically connected with the external cathodes of the multi-row lamp groups,

Wherein, in at least some of the plurality of cathode wirings, the same cathode wiring is electrically connected to the external cathodes of the lamp groups located in different rows, so as to transmit the time-division multiplexing to the external cathodes of the lamp groups located in different rows. The lamp group provides the cathode signal;

The same wiring lamp group includes a plurality of lamp groups electrically connected to the same cathode wiring, and the same type of anode wiring includes a plurality of anode wirings connected to the same wiring lamp group, and the same type of anode wiring is in the lining. The orthographic projection on the base substrate partially overlaps with the orthographic projection of the wires in the same lamp set on the base substrate, and the partial overlap makes the parasitic capacitance voltage generated on the anode wiring of the same type smaller than that of the lamp set. threshold voltage.

In yet another aspect, a display device is provided, including the above-mentioned backlight module.

Description of drawings

Other objects and advantages of the present disclosure will become apparent from the following description of the present disclosure with reference to the accompanying drawings, and may assist in a comprehensive understanding of the present disclosure.

1 is a schematic plan view of a lamp assembly according to some exemplary embodiments of the present disclosure;

2 is a schematic diagram of a backlight module according to some exemplary embodiments of the present disclosure, wherein the array arrangement of lamp groups in the backlight module is schematically shown;

3 is a partial enlarged view of a backlight module according to some exemplary embodiments of the present disclosure, wherein the positional relationship of a lamp group, an anode wiring and a cathode wiring is schematically shown;

FIG. 4 schematically shows the connection of the same wiring lamp group with the anode wiring and the cathode wiring;

5 is a schematic diagram of a plurality of regions of a base substrate included in a backlight module according to some exemplary embodiments of the present disclosure;

6 is a partial enlarged view of a backlight module according to some exemplary embodiments of the present disclosure;

Figures 7A, 7B, and 7C schematically illustrate different embodiments of anode wiring, cathode wiring, and wires within the lamp group, respectively, wherein the anode wiring falls into the first region;

Figures 8A, 8B, and 8C schematically illustrate different embodiments of anode wiring, cathode wiring, and wires within the lamp group, respectively, wherein the anode wiring falls into the second region;

Figures 9A, 9B, and 9C schematically illustrate different embodiments of anode wiring, cathode wiring, and wires within the lamp group, respectively, wherein the anode wiring falls into the third region;

Figures 10A, 10B, and 10C schematically illustrate different embodiments of anode wiring, cathode wiring, and wires within the lamp group, respectively, wherein the anode wiring falls into the third region;

FIG. 11 schematically shows that no parasitic capacitance is formed between like anode wirings; and

FIG. 12 is a partial enlarged view of a backlight module according to some exemplary embodiments of the present disclosure.

It should be noted that, in the drawings for describing embodiments of the present disclosure, the dimensions of layers, structures or regions may be exaggerated or reduced for clarity, ie, the drawings are not drawn to actual scale.

Detailed ways

In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of various exemplary embodiments. It will be apparent, however, that various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring the various exemplary embodiments. Furthermore, the various exemplary embodiments may vary, but are not necessarily exclusive. For example, the specific shapes, configurations, and characteristics of an exemplary embodiment may be used or implemented in another exemplary embodiment without departing from the inventive concept.

In the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. As such, the dimensions and relative dimensions of the various elements are not necessarily limited to those shown in the figures. When the exemplary embodiments may be implemented differently, the specific process sequence may be performed differently from the described sequence. For example, two consecutively described processes may be performed substantially concurrently or in the reverse order of that described. Furthermore, the same reference numerals refer to the same elements.

When an element is described as being "on," "connected to," or "coupled to" another element, the element can be directly on, directly connected to, the other element The other element is either directly coupled to the other element or intervening elements may be present. However, when an element is described as being "directly on," "directly connected to," or "directly coupled to" another element, there are no intervening elements present. Other terms and/or expressions used to describe the relationship between elements should be interpreted in a similar fashion, eg, "between" versus "directly between," " Adjacent" versus "directly adjacent" or "on" versus "directly on" etc. Furthermore, the term "connected" may refer to a physical connection, an electrical connection, a communication connection, and/or a fluid connection. In addition, the X axis, the Y axis and the Z axis are not limited to the three axes of the rectangular coordinate system, and may be interpreted in a broader sense. For example, the X, Y, and Z axes may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purposes of this disclosure, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be interpreted as X only, Y only, Z only, or Any combination of two or more of X, Y and Z such as XYZ, XYY, YZ and ZZ. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments.

Herein, the expressions "trace", "wiring", "wire", etc. may include conductive lines formed of conductive materials, which are typically opaque materials, such as metallic conductive materials such as Cu.

Herein, an inorganic light emitting diode refers to a light emitting element made of inorganic materials, wherein LED means an inorganic light emitting element different from OLED. Specifically, the inorganic light-emitting element may include a sub-millimeter light emitting diode (Mini Light Emitting Diode, abbreviated as Mini LED in English) and a Micro Light Emitting Diode (Micro Light Emitting Diode, abbreviated as Micro LED in English). Among them, the sub-millimeter light-emitting diode (ie Mini LED) refers to a small light-emitting diode with a grain size between Micro LED and traditional LED. Generally, the grain size of Mini LED can be between 100 and 300 microns.

A plurality of tiny LEDs arranged in an array, each N tiny LEDs form an area, and the brightness of different areas is controlled by an integrated circuit. When the multiple tiny LEDs arranged in an array are used as the backlight module of the passive display panel , for example, the screen contrast of the liquid crystal display device can be greatly improved, thereby improving the screen quality.

The Mini LED backlight module includes multiple mini LEDs arranged in an array, and the multiple mini LEDs are divided into multiple lamp groups. FIG. 1 is a schematic plan view of a lamp assembly according to some exemplary embodiments of the present disclosure. As shown in FIG. 1 , a lamp group 10 may include a plurality of mini LED lamp beads 1 . For example, in the embodiment shown in FIG. 1 , one lamp group 10 includes 9 mini LED lamp beads 1, and the 9 mini LED lamp beads 1 are arranged in an array in a manner of 3 rows and 3 columns. It should be noted that the number and array arrangement here are only exemplary, and the embodiments of the present disclosure are not limited thereto. In other embodiments, one lamp group 10 may include a smaller number or a larger number of mini LED lamp beads 1 . In addition, the connection manner of the plurality of mini LED lamp beads 1 included in one lamp group 10 may also be in other forms, and in addition, the plurality of mini LED lamp beads 1 may also be arranged in an array in other manners.

Continuing to refer to FIG. 1 , each lamp bead 1 may include a positive electrode 11 and a negative electrode 12 . In the embodiment shown in FIG. 1 , nine lamp beads 1 can be electrically connected in series in sequence. For example, the negative electrode 12 of the previous lamp bead 1 is electrically connected to the positive electrode 11 of the latter lamp bead 1 through a wire, the positive electrode 11 of the head lamp bead 1 is electrically connected to the anode wiring, and the negative electrode 11 of the rear lamp bead 1 is electrically connected to the cathode wiring electrical connection.

In this paper, for the convenience of description, the anode electrically connected to the anode wiring in one lamp group is referred to as an external anode, which is denoted by reference numeral 2; the cathode electrically connected to the cathode wiring in a lamp group is referred to as an external cathode , denoted by reference numeral 3; the wires in the lamp group used to electrically connect each mini LED lamp bead in series are called the wires in the lamp group, denoted by reference numeral 4.

In this way, unless otherwise specified otherwise, the expression "lamp group" refers to a light-emitting unit formed by a plurality of mini LED lamp beads connected in series, and a lamp group may include: a plurality of mini LED lamp beads 1 for connecting in series Electrically connected to a plurality of inner wires 4 of a plurality of mini LED lamp beads, an external anode 2 , and an external cathode 3 .

For example, a lamp group may include a plurality of mini LED lamp beads arranged in a p*q matrix, where p and q are both natural numbers greater than or equal to 2, for example, in the embodiment shown in FIG. 1, p=3 , and q=3. In other embodiments, p may not be equal to q.

A lamp group includes (p*q-1)pq inner wires 4 of the light group. For example, in the embodiment shown in FIG. 1, a lamp group includes 8 inner wires 4 of the lamp group, which are used to connect nine mini LED The lamp beads are electrically connected together in series.

In this document, unless specifically stated otherwise, the expression "anode wiring" means a signal wire for transmitting an anode voltage signal to an external anode of the lamp group; the expression "cathode wiring" means a signal wire for transmitting a cathode voltage signal (eg, GND) signal) is transmitted to the signal line of the external cathode of the lamp group.

It should be noted that a rectangular frame is used to represent the mini LED lamp bead in FIG. 1, but it can be understood that the mini LED lamp bead in the embodiment of the present disclosure is not limited to being a rectangle, and may be other shapes such as a circle and a polygon.

FIG. 2 is a schematic diagram of a backlight module according to some exemplary embodiments of the present disclosure, wherein an array arrangement of lamp groups in the backlight module is schematically shown. As shown in FIG. 2 , the backlight module may include a plurality of lamp groups 10 . The plurality of lamp groups 10 may be arranged on the base substrate SUB in an m*n matrix. That is, they are arranged on the base substrate SUB in a matrix form of m rows and n columns. For example, the base substrate SUB may be a glass substrate. Mini LED backlight products based on glass substrates have the advantages of low cost, mass production, and large size.

The external anode 2 and the external cathode 3 of each lamp group 10 are electrically connected to the anode wiring A and the cathode wiring K, respectively. Only one anode wire A7 and one cathode wire K1 are shown in FIG. 2 . For example, the backlight module may further include an integrated circuit 7 . One end of the anode wire A is electrically connected to the integrated circuit 7 , and the other end is electrically connected to the integrated circuit 7 . The external anode 2 of the lamp group 10 is electrically connected; one end of the cathode wiring K is electrically connected to the external cathode 3 of the lamp group 10 . In this way, the anode signal and cathode signal output by the integrated circuit 7 can be transmitted to the external anode 2 and the external cathode 3 of the lamp group 10 respectively, so that the light emission of the lamp group 10 can be controlled.

As shown in FIG. 2 , the electrical connection between a lamp group 10 located in the 7th row and the 1st column and the integrated circuit 7 is schematically shown. For example, the lamp group 10 located in the 7th row and the 1st column can be electrically connected to the integrated circuit 7 through the anode wiring A7 (ie, the seventh anode wiring) and the cathode wiring K1 (ie, the first cathode wiring).

In the Mini LED backlight module, the number of lamp groups 10 is relatively large. In the embodiments of the present disclosure, the method of time-division multiplexing of cathode wirings can be used to reduce the number of cathode wirings, thereby reducing the difficulty of wiring layout. That is, one cathode wiring can be electrically connected to the multi-row lamp groups 10, and the cathode signals can be provided to the multi-row lamp groups 10 in a time-division multiplexing manner.

3 is a partial enlarged view of a backlight module according to some exemplary embodiments of the present disclosure, in which the positional relationship of a lamp group, an anode wiring and a cathode wiring is schematically shown. FIG. 4 schematically shows the connection of the same wiring lamp group to the anode wiring and the cathode wiring. In an embodiment of the present disclosure, the plurality of lamp groups 10 in FIG. 2 may be grouped. For example, in the embodiment of FIG. 2 , m rows of lamp groups 10 are provided; considering the driving capability of the integrated circuit 7 , the number of cathode wirings that the integrated circuit 7 can provide is M. In this case, m rows of lamp groups 10 can be divided into N groups, where N is a value obtained by dividing m by M and rounding up.

For example, in the embodiment of FIG. 2 , there are 24 rows of lamp groups 10 , that is, m=24; the number of cathode wirings that the integrated circuit 7 can provide is 6, that is, M=6. In this way, the 24-row light groups 10 can be divided into 4 (24/6) groups.

As shown in FIG. 3 , there are 6 cathode wirings, which are marked as K1, K2, K3, K4, K5 and K6 respectively; and 24 anode wirings are provided, which are respectively marked as A1-A24. In the embodiment of FIG. 3 , the six cathode wirings are concentratedly arranged on one side of the base substrate, but the embodiment of the present disclosure is not limited to this, and the six cathode wirings may also be uniformly distributed on the base substrate.

For example, 4 rows of lamp groups equally spaced in the column direction can be connected to one cathode wiring at the same time. As shown in Fig. 3, the lamp groups L1, L7, L13 and L19 are connected to the same cathode wiring K1. The lamp groups L1, L7, L13, and L19 represent the lamp groups 10 in the first row, the seventh row, the 13th row, and the 19th row, respectively. Lamp groups L2, L8, L14, L20 are connected to the same cathode wiring K2, and so on.

The external cathodes of the lamp groups L1-L6 are respectively electrically connected to the cathode wirings K1-K6, the external cathodes of the lamp groups L7-L12 are respectively electrically connected to the cathode wirings K1-K6, and so on.

The lamp groups L1 to L24 are electrically connected to the anode wirings A1 to A24, respectively, that is, the anode wirings are not multiplexed.

In this paper, for the convenience of description, multiple lamp groups (or multi-row lamp groups) electrically connected to the same cathode wiring are referred to as "same-distribution lamp groups", and each lamp group in the "same-distribution lamp group" is referred to as The connected anode wiring is referred to as "similar anode wiring". That is, the expression "same wiring lamp group" means a plurality of lamp groups (or multi-row lamp groups) electrically connected to the same cathode wiring, and the expression "anode wiring of the same type" means a plurality of lamp groups electrically connected to the same cathode wiring (or multiple rows of lights) connected to multiple anode wiring. The expression "same set of anode wirings" means a plurality of anode wirings located in the same area, and the lamp groups to which these anode wirings are connected are electrically connected to different cathode wirings. For example, referring to FIG. 2 and FIG. 3 in combination, the lamp groups L1, L7, L13, and L19 may be referred to as "same wiring lamp groups", and the anode wirings A1, A7, A13, and A19 may be referred to as "the same type of anode wiring". The anode wirings A1 to A6 may be referred to as "anode wirings of the same group".

5 is a schematic diagram of a plurality of regions of a base substrate included in a backlight module according to some exemplary embodiments of the present disclosure. FIG. 6 is a partial enlarged view of a backlight module according to some exemplary embodiments of the present disclosure. 4 , 5 and 6 , in an embodiment of the present disclosure, the backlight module includes: a base substrate SUB; a plurality of lamp groups 10 disposed on the base substrate, the plurality of lamps Arranged in an array on the base substrate, each lamp group includes a plurality of sub-millimeter light emitting diodes 1, a plurality of inner wires 2 of the lamp group, an external anode 3 and an external cathode 4, and the plurality of inner wires 2 of the lamp group The plurality of sub-millimeter light-emitting diodes 1 are electrically connected in series; a plurality of anode wirings A1 to A24 are respectively electrically connected to the external anodes of the multi-row lamp groups; and a plurality of cathode wirings K1 to K6 are The plurality of cathode wirings are respectively electrically connected to the external cathodes of the plurality of rows of lamp groups, wherein, in at least some of the plurality of cathode wirings, the same cathode wiring is connected to the external cathodes of the lamp groups located in different rows. The cathodes are electrically connected to provide cathode signals to lamp groups located in different rows in a time-division multiplexing manner; For the plurality of anode wirings connected to the same wiring lamp group, the orthographic projection of the anode wirings of the same type on the base substrate does not overlap with the orthographic projection of the wires in the same lamp group on the base substrate.

5 and 6, the plurality of cathode wirings K1-K6 are arranged at intervals, the base substrate includes a plurality of regions, and any two adjacent regions in the plurality of regions are formed by at least one cathode Orthographic projections of the wirings on the base substrate are spaced apart. For example, area ①, area ②, area ③, and area ④ shown in FIG. 5 .

In the embodiment of the present disclosure, the orthographic projections of the anode wirings of the same type on the base substrate are respectively located in different regions of the plurality of regions. For example, the anode wirings A1, A7, A13, and A19 of the same type are located in the area ④, the area ③, the area ②, and the area ①, respectively.

The plurality of anode wirings A1 to A24 include a plurality of groups of anode wirings, and the orthographic projections of the plurality of anode wirings in each group of anode wirings on the base substrate fall into the same area in the plurality of regions. within the area. For example, in the embodiment shown in FIG. 6 , four sets of anode wirings are provided, which are the first set of anode wirings A19 to A24, the second set of anode wirings A13 to A18, and the third set of anode wirings A7 to A18. A12, the fourth group of anode wirings A1-A6. The plurality of lamp groups connected to each group of anode wirings are respectively electrically connected to different cathode wirings.

For example, the plurality of lamp groups are arranged on the base substrate SUB in an array of m rows and n columns. The number of the plurality of cathode wirings is M, the number of the plurality of anode wirings is m, and the number of the plurality of anode wirings is N, wherein m, n and M are all positive values greater than or equal to 2. Integer, m is twice or more than M, and N is the value obtained by dividing m by M and rounding up.

The number of the plurality of regions is N, and N groups of anode wirings are respectively located in the N regions.

The N groups of anode wirings at least include a first group of anode wirings, a second group of anode wirings and a third group of anode wirings, the N regions at least include a first region, a second region and a third region, so The orthographic projections of the first group of anode wirings, the second group of anode wirings and the third group of anode wirings on the base substrate fall into the first area, the second area and the third area respectively, so The orthographic projection of the first group of anode wirings on the base substrate does not overlap with the orthographic projection of the wires in the lamp group on the base substrate.

The orthographic projection of the second group of anode wirings on the base substrate overlaps with the orthographic projection of some of the wires in the plurality of lamp groups on the base substrate, and the third group of anode wirings The orthographic projection on the base substrate overlaps with the orthographic projection of other wires in the plurality of lamp groups on the base substrate.

Some of the wires in the plurality of lamp groups extend in the first direction, and some of the wires in the plurality of lamp groups extend in a second direction, and the second direction intersects the first direction.

The plurality of cathode wirings are divided into N-1 groups, and the N-1 groups of cathode wirings are arranged on the base substrate at equal intervals.

Figures 7A, 7B, and 7C schematically illustrate different embodiments of anode wiring, cathode wiring, and wires within the lamp group, respectively. The embodiments shown in FIGS. 7A to 7C are directed to the lamp group in which the anode wiring falls into the first region.

Referring to FIG. 7A , for the lamp group in which the anode wiring falls into the first region, the cathode wiring thereof may be located on the left side. For example, in one lamp group 10, 8 inner wires 4 of the lamp group are arranged to connect 9 mini LED lamp beads 1 in series. In the sequence of series connection, the 8 inner wires 1 of the lamp group can be respectively referred to as the first inner wire 41 of the lamp group, the second lamp group inner wire 42, the third lamp group inner wire 43, the fourth lamp group inner wire 44, The fifth lamp group inner wire 45, the sixth lamp group inner wire 46, the seventh lamp group inner wire 47, the eighth lamp group inner wire 48, the anode wiring 2 is connected to the head lamp through the via hole located in the anode connection area 21. The anode of the bead 1 is electrically connected, and then passes through the first lamp group inner wire, the second lamp group inner wire, the third lamp group inner wire, the fourth lamp group inner wire, the fifth lamp group inner wire, the sixth lamp group inner wire and the sixth lamp group. The wires, the wires in the seventh lamp group, and the wires in the eighth lamp group are electrically connected to the tail lamp bead 1 , and the tail lamp bead 1 is electrically connected to the cathode wiring 3 through the via hole in the cathode connection area 31 .

The orthographic projection of the first group of anode wirings on the base substrate partially overlaps the orthographic projection of the wires 48 in the eighth lamp group on the base substrate. The orthographic projection of the second group of anode wirings on the base substrate partially overlaps the orthographic projections of the wires 46 in the sixth lamp group and the wires 47 in the seventh lamp group on the base substrate. The orthographic projection of the third group of anode wirings on the base substrate is the same as the second lamp group inner wire 42 , the third lamp group inner wire 43 , the fourth lamp group inner wire 44 and the fifth lamp group inner wire 45 on the base substrate The orthographic projections on are partially overlapped. The orthographic projections of the fourth group of anode wirings on the base substrate do not overlap with the orthographic projections of all the wires in the first group on the base substrate. In this way, the orthographic projection of the same type of anode wiring (eg A1/A7/A13/A19) on the base substrate does not overlap with the orthographic projection of the wires in the same lamp group on the base substrate.

As shown in FIG. 7A , some of the inner wires of the lamp group (for example, the inner wires of the first lamp group 41 , the inner wires of the second lamp group 42 , the inner wires of the fifth lamp group 45 , and the inner wires of the seventh lamp group 47 ) are along the first direction ( For example, the row direction) extends, and some of the inner wires of the lamp group (the third lamp group inner wire 43, the fourth lamp group inner wire 44, the sixth lamp group inner wire 46, the eighth lamp group inner wire 48) are along the second direction (for example, column direction) extension. Through such an extension method, it can be ensured that the orthographic projection of the same type of anode wiring (eg A1/A7/A13/A19) on the base substrate is not the same as the orthographic projection of the wires in the same lamp group on the base substrate overlapping.

Referring to FIG. 7B , for the lamp group in which the anode wiring falls into the first region, the cathode wiring thereof may be located in the middle. The wires 44 in the fourth lamp group extend in an oblique direction (relative to the row or column direction). By designing the wires in the lamp group, it can be realized that the orthographic projection of the same type of anode wiring (eg A1/A7/A13/A19) on the base substrate is not the same as the orthographic projection of the wires in the same lamp group on the base substrate Projections overlap.

Referring to FIG. 7C , for the lamp group in which the anode wiring falls into the first region, the cathode wiring thereof may be located on the right side.

Figures 8A, 8B, and 8C schematically illustrate different embodiments of anode wiring, cathode wiring, and wires within a lamp group, respectively. The embodiments shown in FIGS. 8A to 8C are directed to the lamp group in which the anode wiring falls into the second region. Referring to FIG. 8A , for the lamp group in which the anode wiring falls into the second region, the cathode wiring thereof may be located on the left side. Referring to FIG. 8B , for the lamp group in which the anode wiring falls into the second region, the cathode wiring thereof may be located in the middle. Referring to FIG. 8C , for the lamp group in which the anode wiring falls into the second region, the cathode wiring thereof may be located on the right side.

Figures 9A, 9B, and 9C schematically illustrate different embodiments of anode wiring, cathode wiring, and wires within a lamp group, respectively. The embodiments shown in FIGS. 9A to 9C are directed to the lamp group in which the anode wiring falls into the third region. Referring to FIG. 9A , for the lamp group in which the anode wiring falls into the third region, the cathode wiring thereof may be located on the left side. Referring to FIG. 9B , for the lamp group in which the anode wiring falls into the third region, the cathode wiring thereof may be located in the middle. Referring to FIG. 9C , for the lamp group in which the anode wiring falls into the third region, the cathode wiring thereof may be located on the right side.

Figures 10A, 10B, and 10C schematically illustrate different embodiments of anode wiring, cathode wiring, and wires within a lamp group, respectively. The embodiment shown in FIGS. 10A to 10C is directed to a lamp group in which the anode wiring falls into the fourth region. Referring to FIG. 10A , for the lamp group in which the anode wiring falls into the fourth region, the cathode wiring thereof may be located on the left side. Referring to FIG. 10B , for the lamp group in which the anode wiring falls into the fourth region, the cathode wiring thereof may be located in the middle. Referring to FIG. 10C , for the lamp group in which the anode wiring falls into the fourth region, the cathode wiring thereof may be located on the right side.

For the foregoing embodiments, reference may be made to the descriptions with respect to FIG. 7A to FIG. 7C , which will not be repeated here.

For example, both the anode wiring and the cathode wiring extend in the first direction.

For example, the width of each of the wires in the plurality of lamp groups is greater than the width of each of the plurality of anode wires and the plurality of cathode wires. In this way, it is beneficial to the heat dissipation of the mini LED lamp beads.

In the embodiment of the present disclosure, the orthographic projection of the same type of anode wiring (eg A1/A7/A13/A19) on the base substrate is not the same as the orthographic projection of the wires in the same lamp group on the base substrate overlapping. Therefore, no parasitic capacitance is formed between the anode wirings of the same type. As shown in FIG. 11, for the anode wirings A7 and A13 of the same type connected to the same cathode wiring K1, since there is no difference between the anode wirings A7 and A13 Because of the parasitic capacitance, capacitance voltage caused by the parasitic capacitance, that is, generation of parasitic voltage in the anode wiring A13 is avoided, and abnormal lighting of the LED L13 can be avoided.

FIG. 12 is a partial enlarged view of a backlight module according to some exemplary embodiments of the present disclosure. In the embodiment shown in FIG. 12 , the orthographic projection of the same type of anode wiring on the base substrate and the orthographic projection of the wires in the same lamp group on the base substrate may partially overlap, and the part The overlap makes the parasitic capacitance voltage developed on the homogeneous anode wirings less than the threshold voltage of the lamp group. That is, due to this partial overlap, a parasitic voltage may be generated between the same type of anode wiring (for example, between A7 and A13 in Fig. 11). However, since the overlapping area is small enough, the generated parasitic voltage is small, less than the threshold voltage of the lamp group. In this way, abnormal lighting of the LED can also be avoided.

In the embodiments of the present disclosure, the following driving timings may be employed.

The integrated circuit 7 connects the cathode wirings K1 to K6 successively, and the non-connected cathode wirings are in a high resistance state; at the same time, according to the required display/lighting pattern, each of the anode wirings A1 to A24 is sequentially powered. For example, a series of modulated square wave signals can be output in pWM mode to drive and light up LEDs.

Divide the area where the light groups can be routed into groups. Divide the same type of anode wiring into different areas. Taking a 31.2-inch MINI LED backlight product as an example, the light group area can be divided into 4 (24/6) areas. Then, the plurality of lamp groups are driven row by row without generating parasitic voltages.

Some exemplary embodiments of the present disclosure also provide a display device.

The display device can be any product or component with display function. For example, the display device may be a smart phone, a cellular phone, a navigation device, a television (TV), a car audio body, a laptop computer, a tablet computer, a portable multimedia player (pMp), a personal digital assistant (pDA), etc. Wait.

It should be understood that the display device according to some exemplary embodiments of the present disclosure has all the features and advantages of the above-mentioned backlight module, which can be referred to the above description of the light-emitting substrate, and will not be repeated here.

As used herein, the terms "substantially," "approximately," "approximately," and other similar terms are used as terms of approximation rather than as terms of degree, and are intended to explain what would be recognized by one of ordinary skill in the art Inherent deviation of a measured or calculated value. "About" or "approximately" as used herein includes the stated value and is intended to mean the Specific values, as determined by one of ordinary skill in the art, are within acceptable tolerances. For example, "about" can mean within one or more standard deviations, or within ±10% or ±5% of the stated value.

Although some embodiments in accordance with the present general inventive concept have been illustrated and described, those of ordinary skill in the art will appreciate that these embodiments can be made without departing from the principles and spirit of the present general inventive concept. Subject to change, the scope of the present disclosure is defined by the claims and their equivalents.

Claims (12)

A backlight module, characterized in that the backlight module comprises: substrate substrate; A plurality of lamp groups arranged on the base substrate, the plurality of lamps are arranged in an array on the base substrate, and each lamp group includes a plurality of sub-millimeter light emitting diodes, a plurality of inner wires of the lamp group, an external an anode and an external cathode, the plurality of inner wires of the lamp group are electrically connected in series with the plurality of sub-millimeter light emitting diodes; a plurality of anode wirings, the plurality of anode wirings are respectively electrically connected to the external anodes of the multi-row lamp groups; a plurality of cathode wirings, the plurality of cathode wirings are respectively electrically connected with the external cathodes of the multi-row lamp groups, Wherein, in at least some of the plurality of cathode wirings, the same cathode wiring is electrically connected to the external cathodes of the lamp groups located in different rows, so as to transmit the time-division multiplexing to the external cathodes of the lamp groups located in different rows. The lamp group provides the cathode signal; and The same wiring lamp group includes a plurality of lamp groups electrically connected to the same cathode wiring, and the same type of anode wiring includes a plurality of anode wirings connected to the same wiring lamp group, and the same type of anode wiring is in the lining. The orthographic projection on the base substrate does not overlap with the orthographic projection of the wires in the same lamp group on the base substrate. The backlight module according to claim 1, wherein the plurality of cathode wirings are arranged at intervals, the base substrate comprises a plurality of regions, and any two adjacent regions in the plurality of regions are formed by at least one The orthographic projections of the cathode wirings on the base substrate are spaced apart; Orthographic projections of the same type of anode wiring on the base substrate are located in different regions of the plurality of regions, respectively. The backlight module according to claim 2, wherein the plurality of anode wires comprises a plurality of groups of anode wires, and the orthographic projections of the plurality of anode wires in each group of anode wires on the base substrate falls within the same area of the plurality of areas; The plurality of lamp groups connected to each group of anode wirings are respectively electrically connected to different cathode wirings. The backlight module according to claim 2 or 3, wherein the plurality of lamp groups are arranged on the base substrate in an array form of m rows and n columns; The number of the plurality of cathode wirings is M, the number of the plurality of anode wirings is m, the number of the plurality of groups of anode wirings is N, Among them, m, n, and M are all positive integers greater than or equal to 2, m is more than twice M, and N is the value obtained by dividing m by M and rounding up. The backlight module according to claim 4, wherein the number of the plurality of regions is N, and the N groups of anode wirings are respectively located in the N regions. The backlight module according to claim 5, wherein the N groups of anode wirings at least include a first group of anode wirings, a second group of anode wirings and a third group of anode wirings, and the N regions at least include the first area, the second area and the third area, Orthographic projections of the first group of anode wirings, the second group of anode wirings and the third group of anode wirings on the base substrate fall within the first area, the second area and the third area, respectively, The orthographic projection of the first group of anode wirings on the base substrate does not overlap with the orthographic projection of the wires in the lamp group on the base substrate. The backlight module according to claim 6, wherein an orthographic projection of the second group of anode wirings on the base substrate and some of the wires in the plurality of lamp groups are on the base substrate The orthographic projections of the overlap, The orthographic projection of the third group of anode wirings on the base substrate overlaps with the orthographic projection of other wires in the plurality of lamp groups on the base substrate. The backlight module according to claim 4, wherein the anode wiring and the cathode wiring both extend along the first direction, Some of the wires in the plurality of lamp groups extend along the first direction, and some of the wires in the plurality of lamp groups extend in a second direction, and the second direction intersects the first direction. The backlight module according to claim 4, wherein the plurality of cathode wirings are divided into N-1 groups, and the N-1 groups of cathode wirings are arranged on the base substrate at equal intervals. The backlight module according to claim 8, wherein the width of each of the plurality of inner wires in the lamp group is greater than the width of each of the plurality of anode wires and the plurality of cathode wires width. A backlight module, characterized in that the backlight module comprises: substrate substrate; A plurality of lamp groups arranged on the base substrate, the plurality of lamps are arranged in an array on the base substrate, and each lamp group includes a plurality of sub-millimeter light-emitting diodes, a plurality of inner wires of the lamp group, an external an anode and an external cathode, the plurality of inner wires of the lamp group are electrically connected in series with the plurality of sub-millimeter light emitting diodes; A plurality of anode wirings, the plurality of anode wirings are respectively electrically connected to the external anodes of the multi-row lamp groups; a plurality of cathode wirings, the plurality of cathode wirings are respectively electrically connected to the external cathodes of the multi-row lamp groups, Wherein, in at least some of the plurality of cathode wirings, the same cathode wiring is electrically connected to the external cathodes of the lamp groups located in different rows, so as to transmit the time-division multiplexing to the external cathodes of the lamp groups located in different rows. The lamp group provides the cathode signal; The same wiring lamp group includes a plurality of lamp groups that are electrically connected to the same cathode wiring, and the same type of anode wiring includes a plurality of anode wirings connected to the same wiring lamp group, and the same type of anode wiring is in the lining The orthographic projection on the base substrate partially overlaps with the orthographic projection of the wires in the same lamp set on the base substrate, and the partial overlap makes the parasitic capacitance voltage generated on the anode wiring of the same type smaller than that of the lamp set. threshold voltage. A display device, comprising the backlight module according to any one of claims 1 to 11.

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